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A Common Lisp client library for the Advanced Message Queueing Protocol (AMQP)
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amqp-1-1-0-8-0 lw additions; record delivery tag in basic for later use to ack message
amqp-1-1-0-9-0 lw additions; record delivery tag in basic for later use to ack message
amqp-1-1-0-9-1 lw additions; record delivery tag in basic for later use to ack message
documentation first draft documentation
rabbitmq added emulation for org.nicklevine.rabbitmq.
readmes provide integer-equivalent expiration times to publish
specification external build, take 1
test clean dynamic-extent declarations
tools renaming protocol directories, phase one
.gitattributes attribute housekeeping
.gitignore attribute housekeeping reflect rmq 2.6 compatibility in readme
agpl.txt external build, take 1
amqp-device.lisp changes to streamed framing to eliminate extra messages
amqp-uri.lisp renaming protocol directories, phase one
amqp.asd consolidate stream api in de.setf.utility.codec module added system source dependency diagram.
amqp.svg added system source dependency diagram.
classes.lisp add user-id delegation from basic to the respective channel in order …
commands.lisp provide integer-equivalent expiration times to publish
conditions.lisp renaming protocol directories, phase one
data-wire-coding.lisp more type requirement relaxation, yet with type declarations
device-level.lisp allow sbcl's :flush argument to device-write
device-stream.lisp additions and corrections in connection with spocq sae development. documentation edits
extremely-simple-stream.lisp lispworks stream imports
frames.lisp clean dynamic-extent declarations
macros.lisp clean dynamic-extent declarations
mcl.gif readme build notes, rearrangements to reconcile runtimes
package.lisp consolidate float boundary constants
parameters.lisp correct epoch valus to use a valid time string
processing.lisp clean dynamic-extent declarations
states.lisp renaming protocol directories, phase one
stream.lisp lispworks stream imports
utilities.lisp suppress load/time tests as threads may not be enabled

DE.SETF.AMQP: a Common Lisp client library for AMQP

de.setf.amqp implements a native Common Lisp client library for the 'Advanced Message Queuing Protocol' (AMQP). The implementation comprises wire-level codecs, implementations for the standard protocol objects and methods, a functional interface for message-, stream- and object-based i/o, and a device-level simple-stream implementation.

The library targets the revisions of the published AMQP protocol as of versions 0.8, 0.9, and 0.10. This means that it should work with respective RabbitMQ, OpenAMQ, and Qpid implementations. The implementation architecture should also accommodate a control structure appropriate for the prospective 1.0 version - as least as described in preliminary drafts. For each version, a distinct package comprises the object and method definitions for protocol entities and codecs as generated from the respective specification documents.[1] Each collection is a complete projection, which means there is some amount of duplication. The names - classes, operators, fields, packages and directories all follow more-or-less the naming conventions of the xml protocol documents[2]:

AMQP-1-1-0-8-0 version 0.8 [amqp0-8.xml, amqp0-8.pdf (2006-06)]
AMQP-1-1-0-9-0 version 0.9 [amqp0-9.xml, amqp0-9.pdf (2006-12)]
AMQP-1-1-0-9-1 version 0.9r1 [amqp0-9-1.xml, amqp0-9-1.pdf (2008-11-24)]
AMQP-1-1-0-10-0 version 0.10 [amqp.0-10.xml, amqp.0-10.pdf (2008-02-20)]

In order to modify the translation and/or generate new codecs consult the module.

All protocol versions are expressed through a common interface[3] which is specialized for the common abstract classes. The initial connection phase determines the correct concrete connection implementation to be used to communicate with the broker. Given which the other concrete object and method classes are elected from the same package. One determines the version to be supported directly by loading the respective version's .asd file, which makes its connection class available for negotiation.


This is intended as the base for a distributed semantic store. What one has here is a reasonably complete engineering prototype. It consumes phenomenal amounts of memory and runs astonishingly slowly: 5 - 10 milliseconds and 1 to 10 thousand bytes per round trip. A request entails ten levels of generic function dispatch, half of which require keyword processing. A response call stack is about as deep, but with somewhat less keyword processing. As almost everything between the interface commands and the frame buffers is generated code, once it is clear which aspects should remain available for specialization and/or optional arguments, the protocol call stack would benefit from recasting uninteresting elements as ordinary functions of fixed arguments - depending on implementation type, by a factor of ten to sixty.

It would also be nice to generate a table similar to RabbitMQ's to record protocol conformance and compatibility with brokers. Eventually. The present tests are limited to

  • codec unit tests which validate the respective version's codecs for default argument values.
  • in-memory loop-back tests, used to ensure (for a recent version) that a round-trip does not cons
  • simple data exchanges with a broker.

An Example

The library has been built and probed in the following combinations

AMQP broker
lisp implementation
MCLMCL-5.2, RabbitMQ 1.7.1, AMQP-0.8r0MCL-5.2, QPID-0.5, AMQP-0.9r1
CCLCCL-1.4, QPID-0.5, AMQP-0.9r1
SBCLSBCL-1.0.35, QPID-0.5, AMQP-0.9r1

For example,

$ sbcl
This is SBCL 1.0.35, an implementation of ANSI Common Lisp.
More information about SBCL is available at <>.

* (in-package :amqp.i)

* (defparameter *c* (make-instance 'amqp:connection :uri "amqp://guest:guest@localhost/"))

* (defparameter *ch1* (amqp:channel *c* :uri (uri "amqp:///")))

* (defparameter *ch1.basic* (amqp:basic *ch1*))

* (defparameter *ch1.ex* (amqp:exchange *ch1*  :exchange "ex" :type "direct"))

* (defparameter *ch1.q*  (amqp:queue *ch1* :queue "q1"))

* (amqp:request-declare *ch1.q*)

#<AMQP-1-1-0-9-1:QUEUE {11D7A0F1}>
* (amqp:request-bind *ch1.q* :exchange *ch1.ex* :queue *ch1.q* :routing-key "/")

#<AMQP-1-1-0-9-1:QUEUE {11D7A0F1}>
* (defparameter *ch2* (amqp:channel *c* :uri (uri "amqp:///")))

* (defparameter *ch2.basic* (amqp:basic *ch2*))

* (defparameter *ch2.q*  (amqp:queue *ch2* :queue "q1"))

* (amqp:request-declare *ch2.q*)

#<AMQP-1-1-0-9-1:QUEUE {11DA6891}>
* (list
    (amqp:request-publish *ch1.basic* :exchange *ch1.ex*
                          :body (format nil "this is ~a" (gensym "test #"))
                          :routing-key "/")
    (amqp:request-get *ch2.basic* :queue *ch2.q*))

("this is test #1282" "this is test #1624")
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #1820"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #1998"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #2011"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #2014"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #2022"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #2028"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #2179"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)

"this is test #1282"
* (amqp:request-get *ch2.basic* :queue *ch2.q*)


Which, as an aside, illustrates that brokered messages persist between connections until they have been consumed. Of which a default QPID broker with no persistence support was observed to cache only about 500k bytes (ca. 25,000 messages of 20 bytes each).

An introduction to the API is taking shape. In the meantime, there is a package index, there are a few examples for the library proper and for the RabbitMQ library emulation. hosts a mailing list and a trac instance for discussions and/or reports.


  • 2010-06-10 : corrected and completed float codecs
  • 2011-11-20 : added user-id default for publish to cooperate with rabbitmq @2.6


A .dmg is available for MCL-5.2. Saved images are available for ccl and sbcl.


In principle, de.setf.amqp is built with asdf. Once one has the sources and the asdf configuration in place, evaluate

(asdf:operate 'asdf:load-op :de.setf.amqp.amqp-1-1-0-8-0)
(asdf:operate 'asdf:load-op :de.setf.amqp.amqp-1-1-0-9-0)
(asdf:operate 'asdf:load-op :de.setf.amqp.amqp-1-1-0-9-1)

to load the respective version. The versions intend to be compatible and connections should negotiate automatically to use the correct implementation. Please consult the detailed instructions for the respective runtime for more information.


This version is released under version 3 of the GNU Affero license (GAL).[5] The required components are included as per the respective licenses and covered, in this combined form, under the GAL as well

made with mcl

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